Lafond G, Cao W, Drumheller A, Jolicoeur F B, Zaharia M, Realbrunette J
Department of Ophthalmology, Faculty of Medicine, University of Sherbrooke, Quebec, Canada.
Doc Ophthalmol. 1994;88(1):89-97. doi: 10.1007/BF01203705.
The interaction of retinal dopamine depletion and partial ischemia on the a- and b-wave amplitudes and implicit times of the electroretinogram was examined in adult pigmented rabbits. Seven days after 6-hydroxydopamine treatment, which resulted in a depletion of the amine, partial retinal ischemia was induced by raising the intraocular pressure. As expected, moderate elevation of intraocular pressure produced increases in both a- and b-wave amplitudes. Amplitude hyperresponses were significantly reduced in dopamine-depleted retinas. These reductions were more prominent with relatively lower intensities. However, response delays were not shortened but lengthened by 6-hydroxydopamine pretreatment. Together, these results point to a selective role of dopamine in partial retinal ischemia induced by moderate elevation of intraocular pressure in rabbits.
